topic Re: Power consumption of STOP mode for KE06 in Kinetis Microcontrollers

Power consumption of STOP mode for KE06

kyleyang — Fri, 18 Dec 2015 01:45:36 GMT

I use a FRDM-KE06Z to test power consumption of KE06.

According to schematic, I removed R77 and R11 to measure power consumption of KE06.

I use KDS to create a project and only enable the "STOP operation mode" and generate "SetOperationMode".

Other setting of MCU is default, no external crystal/OSC enable.

According to datasheet, the typical current is around 2uA, but I measure the current is around 120uA.

Did I miss any setting or something wrong?

I attached my project code, thanks.

Original Attachment has been moved to: KE06.7z.zip

Re: Power consumption of STOP mode for KE06

jeremyzhou — Tue, 22 Dec 2015 07:52:52 GMT

Hi Kyle，

After had a brief look through the demo, I think the demo is correct.

My co-worker told me that there are some bugs with the FRDM-KE06 board, when you choose the 3.3v supply, the current consumption is good, however it will increase greatly when choose the 5v supply.
Have a great day,
Ping

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Re: Power consumption of STOP mode for KE06

santiago_gonzal — Tue, 22 Dec 2015 15:26:00 GMT

Hello,

You need to disable the Low Voltage detector, which adds 120 uA to the current.

See the following code:

int main(void)
{
  int counter = 0;
  PMC_Init();
  GoToLowPower(WAIT);
  for(;;) {   
    counter++;
  }
  return 0;
}
void GoToLowPower (uint8_t OperationMode) {
   
    switch (OperationMode) {
        case WAIT:
            /* SCB_SCR: SLEEPDEEP=0 */
            SCB_SCR &= (uint32_t)~(uint32_t)(SCB_SCR_SLEEPDEEP_MASK);
            /* SCB_SCR: SLEEPONEXIT=0 */
            SCB_SCR &= (uint32_t)~(uint32_t)(SCB_SCR_SLEEPONEXIT_MASK);
            __asm("WFI");
            break;
        case STOP:
            /* SCB_SCR: SLEEPONEXIT=0 */
            SCB_SCR &= (uint32_t)~(uint32_t)(SCB_SCR_SLEEPONEXIT_MASK);
            /* SCB_SCR: SLEEPDEEP=1 */
            SCB_SCR |= SCB_SCR_SLEEPDEEP_MASK;
            __asm("WFI");
            break;
        default:
             for(;;);
      }
}
void PMC_Init () {
    /* PMC_SPMSC2: LVDV=0,LVWV=0 */
  PMC_SPMSC2 &= (uint8_t)~(uint8_t)(
                PMC_SPMSC2_LVDV_MASK |
                PMC_SPMSC2_LVWV(0x03)
               );
  /* PMC_SPMSC1: LVWACK=1,LVWIE=0,LVDRE=1,LVDSE=1,LVDE=1,??=0,BGBE=0 */
  PMC_SPMSC1 = (uint8_t)((PMC_SPMSC1 & (uint8_t)~(uint8_t)(
               PMC_SPMSC1_LVWIE_MASK |
               PMC_SPMSC1_BGBE_MASK |
               0x02U|
               PMC_SPMSC1_LVDE_MASK
               )) | (uint8_t)(
               PMC_SPMSC1_LVWACK_MASK |
               PMC_SPMSC1_LVDRE_MASK |
               PMC_SPMSC1_LVDSE_MASK 
               ));
}

Re: Power consumption of STOP mode for KE06

kyleyang — Mon, 28 Dec 2015 11:25:34 GMT

Hi Santiago Gonzalez Fabian

Thanks for your help.

After I disable LVD module, the power consumption down to ~2uA.